Purple Leaf Maple

There are patches of grey/white on the bark of my Norwegian maple (Crimson King). Is it likely to be a fungal infection or mildew? It will not wash off easily but can be scraped off with nail.

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1 Comment To "Purple Leaf Maple"

#1 Comment By Nikki On 03/11/2011 @ 7:46 am

It sounds like the plant just has a lichen. It is not harmful to the plant. Here is more information:
https://www.gardeningknowhow.com/ornamental/fungus-lichen/treatment-tree-lichen.htm ^[1]

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